(Balingen, Germany), pH meter type pH 7310 Inolab Xylem Analytics GmbH (Wellheim, Germany), magnetic stirrer Ecostris Dlab Scientific Co., Ltd. (Beijing, China), universal centrifuge 320R Hettich GmbH and Co., KG (Tuttingen, Germany), and SLW 115 STD POL-EKO-APPLIANCES SPJ (Wodzislaw ...